In all, Rose Fitzgerald Kennedy would have nine children, four boys and five girls. She kept notecards for each of them in a small wooden file box and made a point of writing down everything from a doctor’s visit to the shoe size they had at a particular age. John Fitzgerald Kennedy was named in honor of Rose’s father, John Francis Fitzgerald, the Boston Mayor popularly known as Honey Fitz. Before long, family and friends called this small blue-eyed baby, Jack. Jack was not a very healthy baby, and Rose recorded on his notecard the childhood diseases from which he suffered, such as: "whooping cough, measles, chicken pox." On February 20, 1920 when Jack was not yet three years old, he became sick with scarlet fever, a highly contagious and then potentially life-threatening disease. His father, Joseph Patrick Kennedy, was terrified that little Jack would die. Mr. Kennedy went to the hospital every day to be by his son’s side, and about a month later Jack took a turn for the better and recovered. But Jack was never very healthy, and because he was always suffering from one ailment or another his family used to joke about the great risk a mosquito took in biting him – with some of his blood the mosquito was almost sure to die!

When Jack was three, the Kennedys moved to a new home a few blocks away from their old house in Brookline, a neighborhood just outside of Boston. It was a lovely house with twelve rooms, turreted windows, and a big porch. Full of energy and ambition, Jack’s father worked very hard at becoming a successful businessman. When he was a student at Harvard College and having a difficult time fitting in as an Irish Catholic, he swore to himself he would make a million dollars by the age of 35. There was a lot of prejudice against Irish Catholics in Boston at that time, but Joseph Kennedy was determined to succeed. Jack’s great-grandparents had come from Ireland and managed to provide for their families, despite many hardships. Jack’s grandfathers did even better for themselves, both becoming prominent Boston politicians. Jack, because of all his family had done, could enjoy a very comfortable life. The Kennedys had everything they needed and more.

By the time Jack was eight there were seven children altogether. Jack had an older brother, Joe; four sisters, Rosemary, Kathleen, Eunice, and Patricia; and a younger brother, Robert. Jean and Teddy hadn’t been born yet. Nannies and housekeepers helped Rose run the household.
At the end of the school year, the Kennedy children would go to their summer home in Hyannis Port on Cape Cod where they enjoyed swimming, sailing, and playing touch football. The Kennedy children played hard, and they enjoyed competing with one another. Joseph Sr. encouraged this competition, especially among the boys. He was a father with very high expectations and wanted the boys to win at sports and everything they tried. As he often said, "When the going gets tough, the tough get going." But sometimes these competitions went too far. One time when Joe suggested that he and Jack race on their bicycles, they collided head-on. Joe emerged unscathed while Jack had to have twenty-eight stitches. Because Joe was two years older and stronger than Jack, whenever they fought, Jack would usually get the worst of it. Jack was the only sibling who posed any real threat to Joe’s dominant position as the oldest child.